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Description: Easy to read, multi-color gauge with clearly marked zones Use of high-quality luminous panels, so that the pressure gauge is more clear and accurate when you use it at night. Instructions for use: The luminescent pressure gauge will quickly store the light source in the sun or light illumination, it can discharge light in the dark. The lighting time is longer, and the discharging time is longer. It is very beautiful and very practical. Application: Used for breathing apparatus air cylinder, diving breathing apparatus air cylinder, constant pressure valve, high-pressure pump.Also can be equipped for emergency. Note:Can not be used in (pure) oxygen, hydrogen, and other combustible gases, can not be used in corrosive liquids, high-temperature liquids Specification: Color:Silver Tone